Linear Technology Corporation announces the LT1938, a 2.2A, 25V step-down switching regulator packaged in a 3mm x 3mm DFN. The LT1938 operates within a VIN range of 3.6V to 25V, making it ideal for 12V and unregulated wall transformer inputs.

Its 3.1A internal switch can deliver up to 2.2A of continuous output current at voltages as low as 1.265V. Switching frequency is user programmable from 300kHz to 2.8MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. Its 3mm x 3mm DFN-10 package and high switching frequency, which keeps external capacitors and inductor small, provides a very compact, thermally efficient footprint.

The LT1938 utilizes a high efficiency 3.1A, 0.18 Ohm switch, with the necessary boost diode, oscillator, control and logic circuitry integrated into a single die. Special design techniques enable high efficiency over a wide input voltage range while its current mode topology enables fast transient response and excellent loop stability. Other features include, a power good flag and soft-start capability.

The LT1938EDD pricing starts at $2.75 each and is available from stock.

Summary of LT1938 Features

• Wide Input Voltage Range: 3.6V to 25V
• 2.2A Maximum Output Current
• Adjustable Switching Frequency: 300kHz to 2.8MHz
• Low Shutdown Current: IQ < 1uA
• Integrated Boost Diode
• Power Good Flag
• Saturating Switch Design: 0.18 Ohm On-Resistance
• 1.265V Feedback Reference Voltage
• Output Voltage: 1.265V to 20V
• Soft-Start Capability
• Small 10-Pin Thermally Enhanced (3mm × 3mm)
• DFN Package

Contact information

Alastair Boyd, Area Sales Manager UK, Ireland, South Africa and Israel, Linear Technology (UK) Limited.
3 The Listons, Liston Road, Marlow, Buckinghamshire SL7 1FD
Tel: +44 (0)1628 477066  Fax: +44 (0)1628 478153  www.linear.com Email: aboyd@linear.com